Environmental Entomology (1987) 16, 77-83
David W. Hagstrum (1987)
Seasonal variation of stored wheat environment and insect populations
Environmental Entomology 16 (1), 77-83
Abstract: Temperatures of wheat in the top meter in on-farm cylindrical metal bins in Kansas were uniform and within a favorable range of 27-34°C for the first 12 wk and then declined at rates ranging from 1.3 to 2°C/wk. Cooling of grain from the outside and surface inward and downward resulted in temperature gradients. Grain moisture in the top 0.5 m declined during the first 12 wk and then increased to levels well above initial moisture. Elsewhere in the top meter, wheat retained its initial moisture level except for the tendency of grain near the bin wall to be drier. Population growth rate of the dominant species, Cryptolestes ferrugineus (Stephens), declined over the wheat storage period in the top meter of grain as a result of first the parasite Cephalonomia waterstoni Gahan and then falling temperatures. C. ferrugineus adults showed only a slight tendency to move toward the warmer or moister parts of the bin. Trogoderma glabrum (Herbst) adults and larvae and Trogoderma inclusum LeConte adults, the next most abundant species, were found mainly near the bin wall. Rhyzopertha dominica (F.) were first detected after 12 wk and were found only in the center.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Research topic(s) for pests/diseases/weeds:
environment - cropping system/rotation
population dynamics/ epidemiology
Research topic(s) for beneficials or antagonists:
general biology - morphology - evolution
Pest and/or beneficial records:
| Beneficial | Pest/Disease/Weed | Crop/Product | Country | Quarant.
|
|---|---|---|---|---|
| Rhyzopertha dominica | Stored grain | U.S.A. (mid S) | ||
| Trogoderma glabrum | Stored grain | U.S.A. (mid S) | ||
| Cryptolestes ferrugineus | Stored grain | U.S.A. (mid S) | ||
| Trogoderma inclusum | Stored grain | U.S.A. (mid S) | ||
| Cephalonomia waterstoni (parasitoid) | Cryptolestes ferrugineus | Stored grain | U.S.A. (mid S) |
